Granted Patent
Utility
US 4,930,446 · App. 07/228,390
Methods for controlling poultry barn environments
Inventor:
Richard Huisinga
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Aug 4, 1988
Inventor
Richard Huisinga
Assignee (at issue)
Willmar Poultry Company, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.